题解 | #找出字符串中第一个只出现一次的字符#不懂为什么是中等题
找出字符串中第一个只出现一次的字符
http://www.nowcoder.com/practice/e896d0f82f1246a3aa7b232ce38029d4
string = input().strip()
se = set(list(string))
dic = {}
for i in se:
dic[i] = 0
for i in string:
dic[i] += 1
flag = 0
for i in string:
if dic[i] == 1:
flag = 1
print(i)
break
if not flag:
print(-1)